Wavelength response of perpendicular magnetic recording

Shun Ichi Iwasaki, Yoshihisa Nakamura, Hiroaki Muraoka

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


From the measurements of the surface field of a recording medium, it was obtained that an almost ideal step change distribution of magnetization is formed in perpendicular recording for digital signals. The fact represents that the upper limit of usable recording density is determined only by the resolution of a reproducing head. Therefore, the reproduction by a perpendicular head was successfully analyzed by using the reciprocity theorem. By introducing thickness loss of main pole of the head, the satisfactory coincidence was obtained between the calculated and the measured results in the wavelength response even at the densities of more than 150 kMRPI. In reproducing process, the magnetic interaction between the main pole and the medium acts so as to decrease the effective spacing between them.

Original languageEnglish
Pages (from-to)2535-2537
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number6
Publication statusPublished - 1981 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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